Influence of microsegregation on the onset of the martensitic transformation
|Author:||Ramesh Babu, Shashank1,2; Ivanov, Dmitry3; Porter, David1|
1Materials and Production Engineering, Faculty of Technology, University of Oulu, P.O. Box 4200, Oulu, 90014 Finland
2SSAB Europe Oy, Raahe, 92101 Finland
3EFD Induction a.s, Bøleveien 10, Skien, 3724 Norway
|Online Access:||PDF Full Text (PDF, 1.2 MB)|
|Persistent link:|| http://urn.fi/urn:nbn:fi-fe2018110647366
Iron and Steel Institute of Japan,
|Publish Date:|| 2018-11-06
Due to the volume change accompanying the fcc to bcc or bct crystal structures in steels, it is a common practice to determine phase transformation temperatures using dilatometry. The martensite start temperature (Ms) is often of particular interest. Experimentally, it is found that the start of the martensite transformation is not indicated by a sharp change in the slope of the dilatation curve as is predicted by the Koistinen – Marburger equation. Rather, there is a gradual change in the slope such that the martensite start temperature is ill-defined. The current work shows that this gradual change in slope can be related to chemical inhomogeneity in the steel caused by interdendritic microsegregation. It is shown that combining the Koistinen – Marburger equation with measured concentration profiles allows experimental dilatation curves to be well predicted.
|Type of Publication:||
A1 Journal article – refereed
|Field of Science:||
216 Materials engineering
The authors are grateful for financial support from the European Commission under grant number 675715 –MIMESIS – H2020-MSCA-ITN-2015, which is a part of the Marie Sklodowska-Curie Innovative Training Networks European Industrial Doctorate Programme.
|EU Grant Number:||
(675715) MIMESIS - Mathematics and Materials Science for Steel Production and Manufacturing
© 2019 ISIJ. Published in this repository with the kind permission of the publisher.